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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e35255d0b29d40c0f11a2b0c6cb054ac4c688b546bdea1ed09f83d778316642f' 
  AND token = '+b/AgMmZKOEkgcjbrtKYOYawA+PE1nShoRPik6Dad+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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