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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76f487657054b02002eeea9542e132e206517e8c197a2e0f47130e521f0c0170' 
  AND token = 'BMDLyPYm2EdWIpYtU647GjLUFjrdVRLE92T3tb407nI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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