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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf5b046f0f106a121be5aa0c13110bbf16617ad019dc6d6cc59d2b0f6f77692f' 
  AND token = 'oSOm1ehOYxlH9eNC3pGlRTo85vwXCCXN53fMezTM6zY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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