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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8d6614458833aac0056a6ef92d59d8e973ea005a942b44e38821ba595358042' 
  AND token = 'jmpYTCdC7qY5UeAJTez13OwzCnqM0jBSkDV68bXqGl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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