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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c43db7a6afbc5353fcc5d46c7eae8bc45cad721dccaef5ac394a62f4cc1866c' 
  AND token = 'ndXR2cPBH4QrY6mIprNYINR/GP3mNzsbEDHWrhbQIGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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