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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fed5cea9c02e379252ab6c6d6308089378bc77d5c739ebc6749d2b4f6f982bc' 
  AND token = 'yylV7JQ9FbNDuS1DZzVgyANh8ZzX1KUjN7UfjjJpj34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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