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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ab9d552eff285d72dc69f9d65a66b4e633a4e274539ce37620d7a257d48c55b' 
  AND token = 'KZaI0qf4YjU8N/4vkGAEmJcvEG1yTLap3dYmWNc3lqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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