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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeb7996b101eb047a97db65c93a4346349da3bc2b2ae655dd2ffab2a65cbab59' 
  AND token = 'N/312W4ZXfA81hQCHd72eWH7FLJ0Abye9+qKf4kn0hU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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