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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1963bc74a1f41758ee393d046834e4824a34694401703f819af9fcc347b3c2bf' 
  AND token = '89zvnHOeJMWC2NlWPhCEHyVdMzcoDWjU3XD/4JTmqDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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