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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7f0af290e431b6d4a6d7ef1cf03036ec9ec82f8d6f54d8d4636fb986d287d1e' 
  AND token = 'mMqyv7ez3THgcYLdVjJ8SQS4Bmbln0iMWw71S8a6fj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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