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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6e59b6fa182d4ab263f680d8cc8bc75e2b87f94ed5e52e88d86bb7c82bbbb84' 
  AND token = 'vqczS7mytthP0Vba9cmpHQA0n337a/49MCI2vMlsPyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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