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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44187fdeb80580acae18bf0e4de7f0d2560b0a4397ad63ad96acd96d2873bd54' 
  AND token = '4B6fruyfXombMnMoFjvzT7EreIqLTkuTpdmHP1oKgf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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