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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46013f0ff9ccbb017cb770507a737ec3c84c95382c3e56ac82fe3000e87a4a6e' 
  AND token = 'ocS3MdiJruNagms0bb/4WmXM0ySh0MlJJ+tqJoA83fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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