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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eef101488fe91cd17feee239156d68ad87d279c34be27354c86956520144b8eb' 
  AND token = 'Ys5/8LyFsqcZgvtfWC893HIFAH863xVh1+E8+ndgnVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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