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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e308610b53d95ac03c0ada73f4b609cd419dc18a17c2ad8d0d0447f4e343167f' 
  AND token = 'W/8AgLELDkXtbXSguuDeNMSpI27F8y+KTCSvHlx6oWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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