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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dca0560a1f6ae15ea5aa4d446b8410b670d668f8ef00697de4a127015d2e16e' 
  AND token = 'cR2zYl6fvDf7cD9wWIn2aUZdRaxL5o1F7CfySyjKTKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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