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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '507c617a53d61c964b75e1583cfa4333308475d5dcf8bf86fa366419f928720d' 
  AND token = '6jWDaN3Vtunl8eDllL8lE0kaRnURSytkGLODiU7PfEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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