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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f65034f581f953fe3a33a31cb47e95bd58259a15300e4af8a20a4951a5baa4d4' 
  AND token = 'M45TWLVpEC15SWuVQY1f3kgfX8tyPwY32P4kFi4OeC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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