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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5b9564bbd864cc131b697bd740594bb8dd6b117760bead3539475c56f3551a5' 
  AND token = 'S6TCW3GMaBr80va4e0Jqv4lOg1GMI4Qb35sYV6Qlu5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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