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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abd6883324decb806bb777bc1dd0bb4ea8305b20968665c5abff52838a78b170' 
  AND token = 'JCXsAyMkyyVSsbLkUkd2r68inElkrbvDzsS7yH4A9fM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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