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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54968dd2d5c9c1c1a3ce2e5f35d14940a4cedfb25dc68658c6eb3123d9640b79' 
  AND token = 'Z6ae8r+SLOtes7+7Mlr3N1UcgOZVd1Ld+PGK+2MQTx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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