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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd68f68bb93871673f3332eb287f675d8b23015f8cf6348553319cedebe6bf094' 
  AND token = '47B9QzS8N9tlBHuIVvDplbS5kjCJG1AlEXa54Znb/m0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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