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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '681ec4c93bdbe0246864e4905ed0bce362bcd8d188bc27801b5a4a2fe2d16953' 
  AND token = 'sH1Dav76BDkw41Qr5XyRrKzkfOQbjaqL7yHptsUpVIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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