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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a7c98b0781cec6f7ba53b023fa29766b52476479660fb461323f33b36cc6015' 
  AND token = '9iPh5V60NO+pcgsL65Wf9I/KMqskCo/4JMwI2bF2/+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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