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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '462672e00f7af1d7dc2f444577ea09b613b60095a59ad45ff4e47ecadbc45861' 
  AND token = 'sEo9Uz64TKr05kFYkjBE3vJKW2ypYDZC0VLcMtp5szk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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