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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be5a6deb37e8209f43093da8ba1abe455b5d09e5364a3ce195a7e492d8a3266d' 
  AND token = 'NS8x3lUD1bhL92J0BYRbwlu9q1jS27QsgxUpywgBcyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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