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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b8f290f65540c90b410e194eb5c15595ece29d156eeae6fa7659ce00be03d93' 
  AND token = 'AShKb5fX0qeeLXnAmyhwW0rTZsJoIyXG9HkehIPTsxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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