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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c5c92b135a0baa135927391d30b995e966cfe72572e7c767b330ff60664a6f4' 
  AND token = 'VuzI6x/eF163xVsxn0Fwco7xJIPiG6YU5h1TJ38OeM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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