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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97bc71ed2c35d7502112b2ea12a73c0991b8171abebb95f4b96dd7c8e0f70921' 
  AND token = 'L3U8Fpf9zmHfyIGQact5X4ZgJHBjon9DaXz1k+1DhEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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