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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd8b557c24f021d7679551fc3cf8bc4d353ca7a5e3f5ad91ec2fc9c4ae7a8fc8' 
  AND token = 'hwuhzawtjyOX6BZGEts7AQBOsEeCRsNqjXYwMEyNX4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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