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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cbfb9b46b5cc458734c2c736f4991e704127635b9d901c66323482f32093a02' 
  AND token = '9vAY4Ly5Pfd54ZGfFCqiGdvWpECHILHmJoBm9g61HoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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