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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1e24f429a079f22b0a2a53ce162c3ced0f4aa71f5eaff6c4a52e64c8b888164' 
  AND token = '5jGAecJ5uS52zBAmulFFPyjvHctOgZfeg/Bq4LvJBj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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