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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c84edd2c295ace57ddb5312b5ea74cf4b816ba3a21d345588f402a330b17791d' 
  AND token = 'wpmaSHHOyib5JGhHc8lTFPDlOxDLkTRWTCOCh6b7aaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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