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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2711cb068f716b76585abd61c6f2588b63775af272f20f3863b79c407f991c8f' 
  AND token = 'hOIu37PWmdvVtH1iOcI7kB6+ZFH3ohOFeBY7Wt4B1U8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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