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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '675ca05a1b66ce41ac5f3e09680459beff2d94bbb39ea34c150cd1694c33d902' 
  AND token = '8JyTe2Oe++1V+gVfAJle1eHMQsk6/476iHIs+YJNFOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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