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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a18b0463afa3e4b22f94432cd8d3d7849498267b1b0db8744375ba33394db57a' 
  AND token = '8Zbd2xvsQS0xFnIf6orf45nHeEnqbRlh6p+mtpwDe9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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