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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bf66f6df3df22514032dca136e9c7b9f791702dbce50e1bae4fe8cf27aaa33e' 
  AND token = '2n2T5uEXFql0CoAWQyRjy1nQEMsTfRhISnkv/3JKkjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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