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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '140ec854a1d61af2b3d616254d116c85fcdaabe67f05827f4043390e456d5d7e' 
  AND token = 'fzq+hS2Eyf+XX6dLyVy3Nj3ciATA2RJewXhx8uuSqL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}