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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2351a685966a607e52d8f52934f4f129a845d258dcb541c7e1f883a522f650b' 
  AND token = '0m4DyT2Qu3F60kKQBAExz/RXYzLcQ4bTypHQZ9Wollo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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