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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eba500eb4a9a5b913dd162d7d5e6e59dfb5a9b3258c861a37d7f2f04fb0e313' 
  AND token = 'KPRE4qVBCW0QGSXWKsgICN6jAyV14aJl8/CkQCMomPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00887

JSON explain

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