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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df350aea97e767bde0e76e20881b5bf2a533b974742b37cb5160da7c44d20813' 
  AND token = 'Qgpk0GFG3TVDoWi2hyDGYkvq/D0xJMa2IE1wcts1a6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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