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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4640277cc086695985a8ca374836fe26c163e8363b58c7ac689f49b40d48188c' 
  AND token = 'vv9u4nc/Zfx0111VGTJbr3xhqpoqFQ9whtrKl1lHKLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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