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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c9d3c197d59226f568497b6a762f5394ef04b5d06435990f6aed4f2830ecec0' 
  AND token = '3t+j3LoHObYiPK5fkKzS3iGH3kLq1m8k2hWiwbCk09Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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