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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '025f5b64960fc8b947cdc6d0776b1fb8d1850c394646cd0837bf7859a0fd69eb' 
  AND token = '5Ug/P0HUO4nA4MxxvSjEMvs5Jf+GNwS/vicDlw/DwNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00175

JSON explain

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