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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a132e45bf9410e30bfb9d6670f32fccd2bae62a1fd3d9e9ee16ef7601d1724b1' 
  AND token = 'oGkr8Crt6FpKuVrmFh7qHoofU6jtEzVF5n0C4Qryv1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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