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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31ee4ed87e58c297e82ca0c039e7a3d029f8e19fcad15b5fd4a0634f9c3f8010' 
  AND token = 'Vow7QI3Hyc4VrQ+ecPQFIyfIIcJFLxMFyQKo/g7Yu4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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