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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '459bbdeaa9d3120955b362ae27e92abc70735d125e61a32d4807b1653e0c9ec4' 
  AND token = 'GOJnLuyGdnTz62uFD03ZuIbYCCffuom8iQLVXPoEUmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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