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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '370d9f84f4810d2c80c7aef3ff20df83cdf38c7cd2e7be48abe5fd82cd1c20de' 
  AND token = 'FomyZ23RiiL9vyVYU6vnj2EusdgqJT+67vrPKUv0VA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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