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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39d381c4518ced6ea2803ddc73c3eb5fb5e404f0b682eab69b7e9765fa25416b' 
  AND token = 'v7789G/inRiImvgn8pHMDWjj8bVCRc9NyVYnmhSCuhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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