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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a82cffece941fbe07531c46324fd8355fc4a5eddfd7bf3ba9e070f71cae41a13' 
  AND token = 'pRfUVruR3Vq0/Qfs6RKZkq0/hQOp61T2rMNNqpYgdY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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