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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '738b2f18863c71247447dcc45d43a5e932b7e74e96189b3f6347684be792c92a' 
  AND token = '8Q25aZQnHHvlWNO2TjWdd4YslIYnMWN2EBEvq247N1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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