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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd792f836bc4c65097be6a7b8199ed015c9847990a1ea522a2bf40d02fe9082c6' 
  AND token = '4/91ZlrFqoln3XpXBfc/lVIRvzZFwuXU9MU6qoZoYu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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