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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d4573e3d1c579d50b604ed3a3636edc1a2a2d4d9ad2b03f12a0bbdb6f09a233' 
  AND token = 'qwT5v0+sKSCsUy7eN7j3z7WpHRMsYbjiypq54BuD4jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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