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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f1873421c991892cfd217efe919021aef4f8f72f796ab4a7a62e7fb0ff5c45f' 
  AND token = '6f7PLUn57OAtZD43fyJ08YUBqA0nKL+AhujZvAVKyX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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