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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2894a10d86ec0a38654bd648151e54c77235eee778cc39a810c8c29a225a3087' 
  AND token = 'NzHLBy4uR6zykjYJ2r+uWtiqGZaDzZ3Dp8dH5bc2BpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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