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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2f7d0382ec2a937f0195c5fec4afcbab67da55ead89a2e3b3c736f148bb7501' 
  AND token = '3zJriaAkLNTNvSsQW1W0iAm0x3gBJwc0EpGJ11nk8pY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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