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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96ade45ca19dadf4c4254f5e38f7076a2e7696635b7794ac5a8dc0bbcc8fee34' 
  AND token = 'MK/0cydbH7Lj/D4aitDI3/eArUg+EvUbWR9fuemeJ1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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