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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24fa74179be27cb045ff8abf493a4ecb9524a4aed82b27de9c1a34887f837403' 
  AND token = 'oFF7o8EmpA45oNu2IRKu8BuikgzWpSyNd0GXMs6TsZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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