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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2955dc54472aeb49803227b847ed32c0583b83d6575a83e1440dc0d21b41e028' 
  AND token = 'z17Lv9cduGOBXyJnFDBChpp2aBqlim8B356amT84eC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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