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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '473738095ec2183ba32c0e7e1087d4bc2fe28a11b9a5f33c615b6c9ac358a908' 
  AND token = '90Tnj7bqFXMAzWuFG7R9YTTYLa2KU8VmAadCrgl4N0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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